990 resultados para Holstein cows
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Selostus: Säilörehun käymisasteen ja valkuaistäydennyksen vaikutus maidon tuotantoon
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Selostus: Ravintoaineiden saantiin ja maidontuotantoon vaikuttavat tekijät runsaalla säilörehuruokinnalla
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Selostus: Ohran ja rypsirouheen fysikaalisen käsittelyn vaikutus maidontuotantoon säilörehuun perustuvalla ruokinnalla
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Selostus: Kationi-anionitasapaino ummessaolevien lypsylehmien säilörehuruokinnassa kalsiumin saannin ollessa runsas
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Selostus: Kationi-anionitasapaino ja kalsiumin saanti ummessaolevien lypsylehmien säilörehuruokinnassa
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Selostus: Kationi-anionitasapaino ja magnesiumin saanti ummessaolevien lypsylehmien säilörehuruokinnassa
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Selostus: Ureoidun oljen soveltuvuus risteytysemojen talviruokintaan kahdella eri ruokintatasolla
Leucograma en novillas y becerros (Holstein) infectados con una cepa venezolana de Trypanosoma vivax
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Este trabajo tuvo como objetivo la evaluación del leucograma en novillas y becerros Holstein infectados experimentalmente con una cepa venezolana de Trypanosoma vivax. Los datos fueron analizados a través de la prueba no paramétrica de U de Mann-Whitney. La comparación de las medias de los numeros totales de los leucocitos (NTL) en las novillas, fue estadísticamente significativo (P < 0,05). Los becerros presentaron neutrofilia al compararse las medias totales del grupo infectado y control (P < 0,05). Los promedios totales de los linfocitos y monocitos en las novillas y becerros, fueron estadísticamente significativos (P < 0,05).
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Selostus: Valkuaistäydennyksen vaikutus lypsylehmän pötsistä virtaavan liukoisen rehuperäisen typen pitoisuuteen ja määrään sisärehuruokinnalla
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Selostus: Typpi- ja fosforikuormitus emolehmien ulkotarhassa
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Selostus: Sisäruokintakauden energiamäärien vaikutus risteytysemolehmien tuotantoon
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The objective of this work was to evaluate the performance of heifers fed sugarcane silages produced with and without additives. Thirty-two Holstein heifers were randomly assigned, in a block design, to evaluate rations (46% silage; 54% concentrate; 12% crude protein) containing silages treated with (fresh basis) urea (0.5%), sodium benzoate (0.1%) or Lactobacillus buchneri (3.64x10(5) cfu g-1 ). Inoculation with L. buchneri improved daily gain (1.24 vs. 0.94 kg day-1 ), and the addition of benzoate resulted in better feed conversion (7.6 vs. 9.4 kg of dry matter per kg of live weight), in relation to the untreated silage (control). Treatments did not affect dry matter intake (mean of 2.19% of live weight). Rations containing silages treated with benzoate or L. buchneri showed lower cost per kg of weight gain. Treatment with urea did not improve animal performance, but the cost per kg of weight gain was lower than that of the control ration.
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The relationship between changes in body condition score (BCS) during the postpartum and fertility in beef cows suckling calves under extensive conditions were investigated. Cows were subjected to four BCS evaluations over the postpartum period, starting around one month after calving. In the second evaluation cows were treated with medroxy-progesterone acetate impregnated pessaries and received an injection of estradiol benzoate. At the third evaluation, pessaries were removed and calves were separated from the cows for 96 hours, during which time estrous was observed twice a day, and animals artificially inseminated 12 hours after detection. When calves returned to their dams, bulls were introduced until a 60-day mating period was reached. The distribution of BCS differed among calving groups and evaluations. Results indicated that only cows comprising a BCS 3 (1 to 5 scale) around the first month postpartum can be used in an artificial insemination program with possibilities of becoming pregnant. There was no statistical difference between the calving groups in pregnancy rate. The evolution of the BCS of the cows during postpartum can be used to adjust the start of the breeding season to coincide with the time of the year where herd pregnancy rates will be highest.
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Comprend : Notice sur le caractère et les écrits de Mme de Staël / par Mme Necker de Saussure...
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Comprend : Notice sur le caractère et les écrits de Mme de Staël / par Mme Necker de Saussure...